Update main.yml

Author: mcbarton

.github/workflows/main.yml

@@ -334,7 +334,7 @@ jobs:
           python scripts/automated-notebook-run-script.py --driver chrome
           nbdiff notebooks/smallpt.ipynb $HOME/smallpt.ipynb
         timeout-minutes: 5
-	  
+
       - name: Setup tmate session
         if: ${{ failure() && runner.debug }}
         uses: mxschmitt/action-tmate@v3